The root problem is that democracy requires active engagement. It turns out the hired representatives are not mind readers. However, those with means are able to give more engagement, and thus are disproportionately represented. The squeaky wheel gets the grease, as they say. The guy who is in their representative's face every single day is going to be more apt to get his way. The people who have never even spoken to their representative, even just once, most definitely won't get their way unless by sheer coincidence.

There is no solution to that problem other than to give up democracy, but the alternatives come with their own set of trade-offs. The wonderful world of people problems.